Rock | Resistivity (Ω-m) | Hydrogeological Significance |
Weathered granite | 50 - 300 | Good groundwater potential, occurs at shallow depth suitable for domestic supply |
Fractured granite | 100 - 600 | Very good groundwater potential with high yields suitable for mechanized domestic purposes |
Fresh granite | >1500 | Poor groundwater potential, occurs beyond depth of 40 m |